how to pass these strings from php to javascript

Question

i have 4 strings in my application like this that i want to pass to my js file

$a1=\'[10,20,13,14]\';
$a2=\'[17,15,14,16]\';
$a3=\'[18,24,16,17]\';
$a4=\'[15         


        

Answer 1

$a1='[10,20,13,14]';
$a2='[17,15,14,16]';
$a3='[18,24,16,17]';
$a4='[15,54,18,27]';

echo $a1.",".$a2.",".$a3.",".$a4;

will return

[10,20,13,14],[17,15,14,16],[18,24,16,17],[15,54,18,27]

this is not a valid JSON string.

You can return an object that contains an array of arrays like this:

echo "[".$a1.",".$a2.",".$a3.",".$a4."]";
// => [[10,20,13,14],[17,15,14,16],[18,24,16,17],[15,54,18,27]]

or you can do return an object with named keys to access the different arrays.

echo "{a1:".$a1.",a2:".$a2.",a3:".$a3",a4:".$a4."};
// => {a1:[10,20,13,14], a2:[17,15,14,16], a3:[18,24,16,17], a4:[15,54,18,27]}

---

Or even much butter: Don't build the JSON String on your own and use PHP's json_encode instead:

$a1=array(10,20,13,14);
$a2=array(17,15,14,16);
$a3=array(18,24,16,17);
$a4=array(15,54,18,27);

echo json_encode(array($a1,$a2,$a3,$a4));
// => [[10,20,13,14],[17,15,14,16],[18,24,16,17],[15,54,18,27]]
// or if you want an associative array
echo json_encode(array("a1" => $a1, "a2" => $a2, "a3"=> $a3, "a4" => $a4));
// => {a1:[10,20,13,14], a2:[17,15,14,16], a3:[18,24,16,17], a4:[15,54,18,27]}